Death Finds a Way: A Janie Riley Mystery by Lorine McGinnis Schulze. Janie Riley is an avid genealogist with a habit of stumbling on to dead bodies. She and her husband head to Salt Lake City Utah to research Janie's elusive 4th great-grandmother. But her search into the past leads her to a dark secret.
A: The most abundant isotope of magnesium has 12 neutrons; it is therefore, technically known as magnesium-24. Calculating the number of neutrons in an isotope of any element involves subtracting that element's atomic number from its atomic weight. Magnesium's number is 12, and its weight is just over 24.
Best Answer: An Mg2+ ion is a magnesium atom with a 2e positive charge. This means that it has two electrons (negative charge) less than protons (positive charge). Magnesium as the atomic number 12. This means that each magnesium has 12 protons. Because Mg2+ has a net charge of +2e, it has 10 electrons, as explained above. Magnesium atoms may have 12, 13 or 14 neutrons. You cannot guess that, you have to look it up in an isotope chart.